Mount for photographic objectives



Jan. 2, 1951 F, HINDEN l 2,536,500

MOUNT FOR PHOTOGRAPHIC OBJECTIVES Filed April 22. 1948 IN1/@Mole Ffa/rzHl/vDe/v VMM. Hw

Patented Jan. 2, 1951 UNITED STATES PATENT oFF 2,536,500 ICE MOUNT FORPHOTOGRAPHIC OBJECTIVES Fritz Hinden, Aarau, Switzerland ApplicationApril 22, 1948, Serial No. 22,521 In Switzerland March 12, 1948 6Claims.

in which ,f is the focal length of the photographing system of lenses, ais the distance of the plane to be photographed from the system oflenses in the object space and b is the distance of the photographedplane from the system of lenses in the image space. It is clear from theformula mentioned that it is impossible to photograph clearly in asingle plane at the same time two planes which are at differentdistances from the system of lenses. However, if one dispenses with anexact point-for-point combination of rays in the image space andcontents oneself, for the photographing, with a circle which appears tobe point-for-point to the naked eye and which is called a dispersioncircle, axial vertic-al photographing planes, which lie slightly infront of or behind the mathematically determined photographing plane,can still be employed. The distance of these photographing planes infront of and behind the exactly determined photographing plane is calledthe photographing depth. It is. dependent upon the size of the tolerateddispersicn circle and upon the diaphragm aperture of the photographingsystem of lenses. Corresponding to these two boundary planes of thephotographing depth, which are still tolerated as suiciently sharp, aretwo planes on the other side of the photographing system of lenses, i.e., in the object space, the position of these last mentioned two planesbeing exactly determinable by the foregoing formula. The region betweenthese two boundary planes in the object space is termed depth-sharpnessregion. This depthsharpness region is, therefore, again dependent onlyupon the tolerated dispersion circle in the image space and upon thediaphragm aperture of the photographing system of lenses.

Geometrical'optics shows that the two boundary planes of thedepth-sharpness region in the object space are not symmetrical to theadjustment plane but are at considerably diii'erent distances therefrom.The adjustment plane in the object space is the plane which, accordingto' the foregoing formula, corresponds to the image plane lwhich lies inthe image space, i. e., the plane of the plate or iilm. The known means,such as formulae, tables, scale discs and special devices on the mountsof the objectives, for the determination of the depth-sharpness region,always give the boundaries of the depth-sharpness region for a deniteadjustment plane or distance adjustment and the selected diaphragmaperture. Now, .for many cases,l it is desirable to adjust one boundaryof the depth-sharpness region instead of the adjustment distance on thedistance scale and to read the other boundary of the depth-sharpnessregion. This is rendered possible by the present invention.

.The subject matter of the present invention is a mount for photographicobjectives with a.

diaphragm ring and a distance ring, in which .a sleeve-shaped slidingmember is carried axially...

displaceably in a, carrying ring but is secured against rotationtherein, which sliding member isA mounted in-such a manner on a distancering screwed on a screw thread of the carrying ring that, on rotation ofthe distance ring, it is displaced axially, and, on its front end, thereis mounted a ring with ra, diaphragm mark, which.l

ring has, on the distance scale that is arranged on the front end of thedistance ring, a reading or adjustment mark that indicates the distanceof one boundary plane of the depth-sharpness region, and in which thereis screwed, into a screw thread of the sliding member, a diaphragm ringin which the objective is mounted and which has, on its front part, thediaphragm scale and a reading or adjustment mark which indicates, on thedistance scale, the distance of the other boundary plane of thedepth-sharpness region, in which diaphragm ring the casing with thelaminae of an iris diaphragm is ixed, whilst the diaphragm-groove ringof this iris diaphragm is rotatably mounted in the diaphragm ring and issecured against rotation in relation to the sliding member, s0 that, onrotation of the diaphragm ring, the aperture of the iris diaphragm isaltered and the objective mounted in the diaphragmring undergoes anaxial displacement, thevaxial dis-V.

placement of the objective and the alteration of the aperture of theiris diaphragm being so afd.4

justed in relation to each other that, notwithstanding the alteration ofthe depth-sharpness; thus occasioned, the position of one boundary planeof the depth-sharpness region remains un-` v altered. An example ofembodiment of the subject matter of the invention vis represented in theaccompanying drawings, of which Fig. l is a plan of a mount forphotographic objectives with a diaphragm ring and a distance ring;

Fig. 2 is an axial section through this mount with the objective mountedtherein; and

56 on the apparatus.

invv this carrying ring I is a sleeve-shaped sliding Fig. 3 is adiagrammatic representation of a detail of this mount.

I denotes the carrying ring which has, on its rear part, a. screw thread2 for xing the mount Carried axially displaceably member 3 which, at itsrear end, has a longitudinal slot 4 in which there engages a projection5 kon the inside of the carrying ring I and which 60 prevents thesliding member from rotating. The

sliding''member 3 has an internal screw thread 8 in whichl there isscrewed a diaphragm ring 'l in which the lenses L1, La, La and L4 of theobjective are mounted. ,In therear part oi" this diaphragmy ring 'lthere is inserted the casing 8 of an iris diaphragm which is heldtherein unrotatably by means of at least one screw 9. In front of thiscasing 3 there is rotatably mounted in the diagages inthe longitudinal'vslot 4" of' the sliding member 3. The slidingY member 3 has, on itsperiphery; aV bead l'which is engaged by` a distance ring that is formedcf two rings I4 andV I5 which are rigidly connectedtogether by screwsIE; This bead i3' of the-sliding memberA 3 lies between the; frontendof; the ring i4, which screwed onto a "screw thread' l'l on the front:end 'ofi theY carrying ring l, and a shoulder i8 inside the'ring l5, sothat it is displaced' `axially on rotation of the rings t4' and l5 thatare connected together. 'The rear end of' the ring Ill' lies covered.vup in an annular groove i9 of an annular bead of' the. carrying ring1,. The

ring, l5 hasin front, a conical surface 2i whichY bears' the distancescale. Onthe front end. of' the sliding member '3' there is fixed a ring22 which extends over. the conical surface 2| that bears the distancescale .and which has,v on its, rear end, a recessfwhich is; bounded onone sidev bya reading or adjustingy edge 23; for the dis.-v

tance scale and'within. which a diaphragm mark Vis provided. This ring22' lies Vin an annular groove 24, which is open at the back, inthefront widened part of the' diaphragm ring 1. The cuter Wallv of. thisannularY groove 24, whichv overlaps the'. conical suriacei 2l, has, atits rear edge, a recess*v which is bounded on one side by a readingoradjusting edge The diaphragm scale is put on this recess in the outer.Wall of the annular groove 25'. l

j The two reading or setting. edges 23 and 25 cut out a section of thedistance. scale,l the reading or adjusting edge 23' indicating the moredistantboundary of the depth-sharpness region and the reading or.setting edge 25 indicating the nearer boundary of' the depth-sharpnessregion.

This. section ofi the distance scale which. isV cut. out of.` thedistance scale and indicates the set.

depth-sharpness region is advantageously. made.` prominent by providing,on the recess of the ring 22, a white. edge 2.6 which is visible uptothe reading or. adjusting edge 25.

In order to facilitate the adjustment andreading stillfurther, the Word'distant or some other corresponding indication may be engraved` next tothe reading or adjusting edge 23 and the word near or some othercorresponding indication may be engraved next to the. reading oradjusting edge 25.

Naturally, it would alsoI be possible to provide index strokes insteadof the reading. or adjusting edges 23 and 25.

Now,it isextremely important that the pitchA ofthe screw thread 6 intowhich the diaphragmring 1 is` screwed, and the construction of' theirisA diaphragm, the casing of which is denotd by 8, auditsdiaphragm-groove ringY l0, should be brought into agreement with eachother in such a manner that the set distance of the objective that ismounted in the diaphragm ringl 'lshould beso alter-cd,V on the rotationof .they latter that, notwithstanding the'alterati'on, thus occasioned,

of' thel depth-sharpness; region, one 'or' its set boundary planes, inthe case represented the more distant plane, should remain unaltered.Obviously, the mount could also be so constructed that, instead of themore :distant boundary plane, the

earer boundary plane of the depth-sharpness region would remainunaltered on the rotation of the. diaphragm ring.

Now, if, for example, a number of objects which are at differentdistances from the photographing objective are ta be photographed in asingle photograph, the distance of the remotest object from thephotographing objective being, for example, l0 metres, andV thediaphragm aperturev being fc4, the distance ring lli, I5 is rotated sothat the readingory adjusting edge 23 ofv the ring 22 lies on thegraduation, which indicates the distance of 10 metres, of the distancescaleV put on the conical surface 2l of the ring I5, and then, byrotating the diaphragm ring l, the graduation marked e of the diaphragmscale is ated dispersion` circle; If, in anotherl case, there.

is set, for example, the problem of photograph-- ingsimultaneously anumber/of' objects which are at a distance of' from 1 metre to 5 metresfrom the photographing objective, the diaphragm aperture necessary forthis purpose is adjusted in such' aI mannerl that first the reading oradjusting edge 23 is set to the graduation, which indi'- cates 5 metres,of the distance scale on the conical surface 2I of the ring l5 and thenthe reading or: adjusting edge 25 of the diaphragm ring 3 is set tothegraduation, which indicate-s 1w In this way, the

metre, of this distance scale. necessary diaphragm aperture is alreadyadjusted 5' and it can now be read c-n the diaphragm scale at thediaphragm mark 2 of the ring 22. InA both cases; it is unnecessary toadjust theY set y distance of the photographing objective separately.

WhatI cla'm is: Y 1. A mount for a photographic objective, said mountcomprising an externally screw-threaded.

carrying ring, a distance ring screwed on the.

screw thread of Said carrying ring, a sleeve' e shaped', internallyscrew-threaded. sliding member carried axially displaceably butunrotatably in said carrying ring and mounted onsaid distance ring andadapted, on rotation of said distance ring, to be displaced axially, adiaphragmmark ring bearing a diaphragm mark and mounted on the front endof said sliding member, a distance scale arranged on the front end ofsaid distance ring, said diaphragm-mark r'ng having, on said distancescale, an indicating marl; for indicating the dstance of one boundaryplane of; the depth-sharpness region, a diaphragm ring.y

depth-sharpnessV region, an iris diaphragm, and a casing, Withthelaminaeof said irisv diaphragml.

xed in said diaphragm ring, said iris diaphragm having a"diaphragm-groove ring, said dia'- phragm-groove ring being rotatablymounted in saiddiaphragm ring and unrotatable in relation to-sadslidingv member, the aperture of said iris diaphragm being altered andsaid objective undergoing an axial displacement on rotation of saiddiaphragm ring and the axial displacement of said objective and thealteration of the aperture of said iris diaphragm being so adjusted inrelation to each other that the position of one boundary plane of thedepth-sharpness region remains unaltered notwithstanding the alteraton,thus produced, of the depth-sharpness region.

2. A mount for a photographic objective, said mount comprising anexternally screw-threaded carrying ring, a distance ring screwed on thescrew thread of said carrying ring, a sleeveshaped, internallyscrew-threaded sl`ding mem= ber carried axially displaoeably butunrotatably in said carrying ring and mounted on said distance ring andadapted, on rotation of said distance ring, to be displaced axially, adiaphragmmark ring bearing a diaphragm mark and mounted on the iront endoi said sliding member,

a distance scale arranged on the front end of said distance ring, saiddiaphragm-mark ring having, on sa'd distance scale, an indicating markfor 'indicating the distance of one boundary plane of thedepth-sharpness region, a diaphragm ring screwed into said screw threador said sliding member, the objective be'ng mounted in said diaphragmring, said diaphragm ring having, on its iront part, a diaphragm scaleand an indicating mark for indicat'ng, on the distance scale, thedistance of the other boundary plane of the depth-sharpness region, aniris diaphragm, and a casing, with the laminae of said iris d'aphragm,xed in said diaphragm ring, said iris diaphragm hav'ng adiaphragm-groove ring, said diaphragmgroove ring being rotatably mountedin said diaphragm ring and unrotatable in relation to said slidingmember, the aperture of said iris daphragm being altered and saidobjective undergoing an axial displacement on rotation oi said fdiaphragm r'ng and the axial displacement of said objective and thealteration of the aperture oi said iris diaphragm being so adjusted4 inrela'- tion to each other that the position of one boundary plane of thedepth-sharpness region remans unaltered notwithstanding the alteration,thus produced, of the depth-sharpness region, said sliding member havinga longitudinal slot at its rear end. a projection on said carryng ringand engaging in said slot and preventing the rotation of; saidslidingmember in said carrying ring, a stud screwed rad'ally into saiddiaphragm-groove ring, said diaphragm ring having a transverse slot onits periphery and said stud passing through SaidV transverse slot andpreventing said diaphragm-groove ring from rotat'ng with said diaphragmring.

3. A mount for a photographic objective, said mount comprising anexternally screw-threaded carrying ring, a distance ring screwed on thescrew three-dof said carrying rr=ng, a sleeveshaped, internallyscrew-threntledv sliding member carried axially displaceably butunrotatably in said carrying ring and mounted on said distance ring vandadapted, on rotation of said distance ringf'to be displaced axially, avdiaphragm-mark ring bearing ardiaphragm mark and mounted on the front'end of said sliding member, a distance scale arranged on the front endof said distance ring, said diaphragm-mark ringhaving, on said 6,distance scale, an indicating mark for indicating the' distance of oneboundary plane of the depthsharpness region, a diaphragm ring screwedinto said screw thread of sa'd sliding member, the objective beingmounted in said diaphragm ring,l said diaphragm ring having, on itsfront part, a diaphragm scale and an indicating mark for indicating, onthe distance scale, the distance of the other boundary plane of thedepth-sharpness region, an iris diaphragm, and a casing,

' ring and unrotatable in relation to said sliding member, the apertureof said iris diaphragm being altered and said objective undergoing an'ax'al displacement on rotation of said diaphragm ring and the axialdisplacement of said objective and' the alteration of tie aperture ofsaid iris diaphragm being so adjusted in relation to each other that theposit'on of one boundary plane of the depth-sharpness region remainsunaltered notwithstanding" the alteration, thus produced, of thedepth-sharpness region, said sliding 'member having a longitudinal slotat its rear end, a projecton on said carrying ring and engaging in saidslot and preventing the rotation of said sliding member in said carryingring, a stud screwed radially into said daphragm-groove ring, saiddiaphragm ring having a transverse slot on` its periphery and said studpassing through said transverse slot and preventing said d'aphragmgroovering from rotating with said diaphragm ring, said distance ring havingon its front end a conical surface bear'ng the distance scale, the rearend of said diaphragm-mark ring overlap-` ping said conicalsurface andhaving a recess and, on one side of said recess, an edge which serves,on the distance scale, as van indicatng mark for one boundary plane ofthe depth-sharpness region, said diaphragm ring having a widened frontpart and a rearwardly open annular groove in said widened front part andsaid diaphragm-mark rng lying in said annular groove, the outer wall ofsaid annular groove having, on its rear edge that overlaps saiddistance-scale bearing conical surface on the front end of said distancering, a recess on which the diaphragm scale is put and which "s boundedon one side by an edge which serves as an indicating mark, on thedistance scale, for the other boundary plane of the depth-sharpnessregion. y 4. A mount for a photographic objective, said 'f mountcomprising an externally screw-threaded carrying ring, a distance ringscrewed on the screw thread of said carrying ring, said distance ringbeing formed or wo ring parts connected together 'by screws, a slidingsleeve-shaped internally screw-threaded sliding member, an annularbeadon the outer surface of said sliding member" and surrounded by the saidtwo ring parts, said sliding member being displaced axially on screwingsaid distance ring on said carrying ring, aldi-- aphragm-mark ringbearing a diaphragm mark and mounted on the iront end of said sliding.

mark .for indicating, .on the distance scale, thel distance of. theother boundary plane of the depth-sharpness region, an. iris diaphragm,.and a, casing, with thelainin'ae of said iris diaphragm, fixed insaid-diaphragm ringsaid iris diaphragm having -a diaphragm-groove ring, saiddia- .phragm-groove ring being rotatably mounted in said diaphragm ringand unrotatable in relation to said sliding member, the aperture-of saidiris diaphragm Ibeing altered and said objective undergoing an axialdisplacement on rotation of said diaphragm ring .and the .axialdisplacement of said objective andthe alteration of the. afpertureofsaid ir-is diaphragm. being so adjusted in relation-to each other thatthe position of 'one boundary plane 'oi the depthfsharpnessg. region:remains unaltered .notwithstanding the altera tion, thusv produced, ofthe depth-sharpness.. region'.

.5. A, mount for a photographic objective., said mou-nt. comprising an.externally screw-.threaded carrying ring, a distance ring screwed onthe. screw threadgo-f -said carrying ring, said distance ring beingformed ci two .ring parts ccnnected Vtogether by screws, a slidingsleeve-shaped inter-- nelly screw-threaded sliding member, an annularbead on the outer surface of said sliding member and surrounded by thesaid two ringparts, said sliding member being displaced axially onscrew. ingfsaid distance. ring on said carrying ring, a, diaphrag-mrmark ring bearing a diaphragm mark, and mounted-on the front,end of said sliding member, a distance scale arranged on the :irontendof said distance ring, said diaphragm-markring having, onY saiddistance scale, an. indicating mark; for indicating the distance of oneboundary plane of the depth-sharpness region, a diaf. phragm ringscrewed into saidscrew. thread of Saidsliding member,V the objectivebeing mountedin said. diaphragm ring, said diaphragmA ringhav. ing., onits front part, a diaphragm sca-1e. and an indicating mark forindicating, on the distance scale, the distance of the other boundaryplane of the depth-sharpness region, an iris;y diaphragm,

and. -a casing, with the. laminae of said iris dia'-- phragm, .xed insaid diaphragm rin-g, vsaid iris. diaphragm having a diaphragm-groovering,;said diaphragm-groove ring being rotatably mounted; said.diaphragm ring andunrotatable in rela` tion, to said sliding member, theaperture of said diaphragm being altered and saidV objective undergoingan .axial displacementl on rotation of said diaphragm ring and the axialdisplacement of. said objective and ther alteration of the aper ture ofsaid\iris diaphragm being so,v adjusted in relation to eachother thatthe position, of one boundary plane of the depth-sharpness Vregionremains unalteredY notwithstanding the; altera-- tion, thus produced, ofthe depth-sharpness. region, said sliding member having a longitudinal..slot at its rear end, a. projectionon said lcarrying ring and engagingin said slot and preventing the rotation of said sliding member on saidcarrying ring, a stud screwed radially into said diaphragme groove ring,said diaphragm ring, having a trans` verse slot on its periphery andsaid stud passing. through said transverse slot and preventing saiddiaphragm-groove `ring from rotating with said diaphragm ring.

6. A mount. for a photographic objective, said mount comprising anexternally screw-threaded carrying ring, a distance ring screwed on thescrewV thread ci said carryingV ring, said distance ring, being'iormedoitwo ring partsccnnected to .gatherv by'screws, a sliding. sleeve-shapedinter lar bead on the -outersuriace of `said sliding member :andsurrounded by the said, tworing parts, saidLsliding membervbeingdisplaced axially. 0n screwing said distance .ring on saidcarry-ing ring, a. diaphragm-.mark ringV bearing .a da phragm mark andmounted on the vfront end of said sliding member, :a distance scalearranged on the front end of said -distance ring, .said diefAphragmem'ark ring having, on said distancescale, an .indicating AmarkYfor indicating the4 distanceof oney boundaryl plane gof thedepth-sharpnessv region, 'a diaphragm. ring screwed into said screwthread of said sliding member, the objective be-L ingxmounted in saiddiaphragm ring, said diaphragm Aring havin .1, on its` front part,y adia- .phragm scale and an indicating mark, for indieating, ontheqdista-nce scale, the distance of. the. other boundary plane. of thedepth-sharpness; region, fan. iris: diaphragm, .anda casing, with thelaminas of said iris diaphragm, fixed in said,.=di' aphragm ring, Saidiris diaphragm having adia-s phragm-groove ring, said diaphragm-groove.ring

being rotatably mounted in said .diaphragmgrng andiunrotata-bleinrelation to said sliding fmember, theaperture of said iris diaphragmbeing altered and said objective undergoing 'an axial displacement onrotation of said diaphragm ring and the axial displacement of saidobjective. and; the alteration of the aperture ofl said iris-dia. phragmbeing so adjusted in .relation to each other that the position of oneboundary plane of the depthfsharpness reg-ion remains unalterednotwithstanding the alteration, thus produced, of the 'dept-hrsharpnessregion, said sliding member having ya longitudinal slot 'at its rearend, a, profy jectionon said carrying ring and engaginginsaid sloty andpreventing'the rotation of said. sliding member on said carrying ring,a. stud screwed.. radially into said diaphragm-*groove ring, saiddiaphragm ring having a transverse slot on its. periphery andv said studpassing through said transverse slot and preventing said'diaphragmgroov. ring from rotating with said diaphragm ring., saiddistance ring having on itsfront end a. conical surface bearing theydistance scale, the rearend of `said diaphragm-.mark ring overlaps'pingl said conical surface and having a recess and., on one side of saidrecess, an 'edge which serves; on the distance scale, as an indicatingmark for one boundary plane of the depth-sharpness region,` saiddiaphragm ring having a widened, front` part and a rearwardly open'annular groove in said 'widened front part and said diaphragm= mark'ringlying in said annular groove, the outer wall ci said lannulargroove having, on its 'rear edge that overlaps said distance-scalebearing conical surface on the iront end of said distance ring, a recesson which the diaphragm scale 'is put and which is bounded on one side by'an edgewhich serves as an indicating mark, on. the di's- Number NameDate.

1,848,402. Wollensak Mar. 8., 1932 21,026,724.. Wollensak. s-- Jan..7.,. 1936i 2,279,476; Mihalyi'. Apr. 14, 194,2 2,315,977

